At the beginning of the onset of the disease, there will be relatively small black dots in the leaves, and then gradually expand over time. The edge of the lesion is black, the middle is dark gray, with black spots, until the whole leaves and plants are engulfed.
1. If it is found in the early stage, the diseased part can be pruned off. It is better to use the sharp scissors that have been treated and disinfected to reduce the damage to the plant. Then it is better to keep it at the temperature of about 10 ℃. Cut off bad leaves to burn immediately, so as not to infect other branches.
2. The drugs used are mainly bactericidal, which can be used with carbendazim or Bordeaux solution and water. The whole plant should be sprayed, and no place should be left out. After spraying, it's better to take the place with wind to air.
3. Many diseases are caused by excessive water, so pay special attention to the water supply and reduce the amount of water during maintenance. Replace the old soil and sterilize the roots before planting. Pay attention to add more pipe protection to it and put it in a windy place for maintenance.
